Tag: cell-the basic unit of life

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Questions Related to cell-the basic unit of life

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The scientist who first observed bacteria and protozoa is

  1. Antonie Van Leeuwenhoek

  2. Robert Hooke

  3. Mathias Jacob

  4. Robert Brown
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Antonie van Leeuwenhoek (1632-1723) described cells in a drop of pond water using a microscope made by him. He was the first person to observe bacteria and protozoa. By observing the movement of bacteria or protozoa he named them animalcules. Therefore, the correct answer is option A.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

What made the study of cells possible?

  1. Discovery of microorganism

  2. Division of offsprings

  3. Evolution of generation

  4. Invention of microscope
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The size of cells and microorganisms are too small to observe by naked eyes. It was impossible to study them but with the invention of the microscope, cells became visible and many new discoveries were made about them. Therefore, the correct answer is option D.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The branch which deals with the study of cell structure and function is known as

  1. Histology

  2. Ecology

  3. Morphology

  4. Cytology
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cytology is the branch of science which, deals with the study of form, structure, and contents of cells as observed under the microscope. The term was coined by Hertwig in 1893. Cytology has enormous application in genetics, biomedical research etc. It is used for diagnosis and screening of various diseases. It can also be for the study of the genetic composition of a living organism.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Which of the following is the exception of cell theory?

  1. Bacteria

  2. Fungi

  3. Lichen

  4. Virus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Virus are non-living crystallisable entities which replicate in other living cells. They do not have a cellular structure and are an exception to cell theory.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The branch of biology dealing with structures, function and reproduction of cell is

  1. Physiology

  2. Anatomy

  3. Histology

  4. Cell Biology
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cell biology is a scientific study of the cells. It is concerned with the physiological properties, structure, the organelles it contains, interactions with the environment, life cycle, division and death of the cell. It is associated with the morphological and molecular level of the cell.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Which of the following is not correct?

  1. Robert Brown discovered the cell.

  2. Schleiden and Schwann formulated the cell theory.

  3. Virchow explained that the cells are formed from pre-existing cells.

  4. A unicellular organism carries out its activities within a single cell.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Robert Brown discovered the nucleus. He discovered the presence of nucleus in the cells of orchid root. Nucleus is a specialized double membrane bound protoplasmic body which contains all the genetic information for controlling cellular metabolism. 

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

Indicate weather the statement is true of false :
Robert Hook discovered the nucleus.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Robert Hooke was mathematician and physicist. He discovered the cell. He took a piece of spanish oak and prepared thin slice by means of sharp pen knife. A deep planoconcave lens was used for throwing light on cork piece. The latter was observed under the microscope. The piece of cork was found to have a honey comb structure with a number of box like compartments, each having a pore and separated from others by diaphragms. Robert Hooke named the compartments as cellulae, now known as cells.
Nucleus was discovered by Robert Brown. He discovered the presence of nucleus in the cells of orchid root. Nucleus is a specialized double membrane bound protoplasmic body which contains all the genetic information for controlling cellular metabolism and transmission to the posterity.

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

The unit of measurement used for expressing dimension (size) of cells is

  1. Centimeter

  2. Millimeter

  3. Micrometer

  4. Meter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The majority of cells are small. Normal animal cell size varies from 10 to 30 micrometer, while plant cell stretches from 10 to 100 micron. 

Multiple choice bio-chemistry cell-the basic unit of life introduction to cell discovery and cell theory cell discovery cell discovery and cell theory cell as structural and functional unit

What is the structural and functional unit of living organisms?

  1. Tissue

  2. Cell

  3. Organ

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cells are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells. Cells provide specific conditions, for the occurrence of the metabolic reactions. These have specialized enzymes, which catalyze the biochemical reaction and regulates the functions of the body.